Marinate the mushrooms with the ingredients listed under marinade and keep aside for 15 minutes

Heat oil in a pan, add marinated mushrooms and fry on a high flame for 3-4 minutes and then cover and cook on a low flame till the mushrooms are tender and cook till it dries

In another pan put 2 tsp oil, add sliced onion, green chillies and fry till translucent and then add this to the mushroom and mix it well and then keep it aside

Cut the panini into half, apply mayonnaise on one side of it, spread lettuce on top of it and then add this mushroom filling and top it with cheese and then cover it with the other half and then serve hot